ELSYS ERSCO2 Lite Room Sensor User Manual

ELSYS ERSCO2 Lite Room Sensor

Elektroniksystem i Umeå AB Industrivägen 12, 90130 Umeå, Sweden
E-mail: support@elsys.se ǀ Web: www.elsys.se
Specifications in this document are subject to change without notice. ©Elektroniksystem i Umeå AB 2020

Important safety information

Read this manual before attempting to install the device!
Failure to observe recommendations included in this manual may be dangerous or cause a violation of the law. The manufacturer, Elektroniksystem i Umeå AB will not be held responsible for any loss or damage resulting from not following the instructions of this operating manual.

• The device must not be dismantled or modified in any way.

• The device is only intended for indoor use. Do not expose it to moisture.

• The device is not intended to be used as a reference sensor, and Elektroniksystem i Umeå AB will not be held liable for any damage which may result from inaccurate readings.

• The battery should be removed from the device if it is not to be used for an extended period. Otherwise, the battery might leak and damage
  the device. Never leave a discharged battery in the battery compartment.

• The device must never be subjected to shocks or impacts.

• To clean the device, wipe with a soft moistened cloth. Use another soft, dry cloth to wipe dry. Do not use any detergent or alcohol to clean the device.

Disposal note in accordance with ElektroG and WEEE Directive 2012/19/EU

The device, as well as all the individual parts, must not be disposed of with household waste or industrial waste. You are obliged to dispose of the device at the end of its service life in accordance with the requirements of ElektroG in order to protect the environment and to reduce waste through recycling. For additional information and how to carry out disposal, please contact the certified disposal service providers. The sensors contain a lithium battery, which must be disposed of separately.
Elektroniksystem i Umeå AB Industrivägen 12, 90130 Umeå, Sweden
E-mail: support@elsys.se ǀ Web: www.elsys.se

Description

ERS CO2 Lite is an advanced indoor climate sensor for LoRaWAN® wireless network. The sensor measures CO2 levels, temperature, and humidity. ERS CO2 Lite is a battery-powered device and is designed to be wall-mounted. The motion sensor can be used for presence monitoring systems. ERS CO2 Lite is equipped with NFC (Near Field Communication) and can easily be configured from a smartphone.

The barcode contains DevEUI and sensor type. This label is located at the back of your device

Main features of ERS CO2 Lite

• Compatible with LoRaWAN® specification 1.0.3
• Measures ambient CO2 levels
• Measures ambient temperature
• Measures ambient humidity
• Easy installation
• Easy configuration
• May be installed on a wall or any surface
• Battery-powered
• Long-range communication
• Configurable over NFC
• Configurable over the air
• Ten years of battery life
• Supported channel plans: US902-928, EU863-870, AS923, AU915-928, KR920-923, RU864, IN865 & HK923
• CE Approved and RoHS compliant
Depending on settings and environmental factors

Calibration

The ERS CO2 Lite is calibrated in factory. Due to delivery and handling, the CO2 sensor may give false values for the first three (3) ABC-periods. These false values do not indicate that the sensor needs manual calibration. After approximately 24 days the sensor will be self-calibrated.
Forced calibration is not required in normal environments.

How to calibrate
The CO2 sensor is maintenance-free in normal environments thanks to the built- in self-correcting ABC algorithm. If manual calibration is needed, please follow these instructions:

After configuration, bring the device outside in the fresh air for 10 minutes. The CO2 sensor will then use the CO2 levels from fresh air to compare with the CO2 levels indoors to give correct values.

ABC Algorithm
ABC stands for Automatic Baseline Correction, a self-calibration function for achieving maintenance-free gas sensors. This sensor has a life expectancy of at least 15 years and does not require any further calibration when used in normal indoor air applications.

The ABC algorithm constantly keeps track of the sensor’s lowest reading over a preconfigured time interval, and slowly corrects for any long-term drift detected as compared to the expected fresh air value of 400 ppm (or 0.04%vol) CO2. In normal indoor applications, the carbon dioxide level drops to nearly outside air some time during a week. By sampling the values for a period of 8 days and then comparing the lowest value with the meters 400 point, the meter is able to understand if it needs to adjust the zero point.
This algorithm takes advantage of the fact that the CO2 level stabilizes in buildings when unoccupied.

Calibrate for constantly occupied spaces
If a space is constantly occupied and there are no periods when outside levels drop to background levels, then the ABC algorithm will not work. This is the case for greenhouses or in closed confined spaces where CO2 levels may always be elevated. For these applications, the ABC function must be turned off. Without ABC operating, the sensor should be calibrated manually every two or three years.

Installation

1. Remove the back panel of the sensor with a small screwdriver.
   

2. Install the batteries. The ERS CO2 Lite requires one or two AA batteries. The battery type is 3.6V Lithium Battery (ER14505). You can use one battery, but it’s recommended that you use two for best performance and battery life. Use battery slot A if only one battery is used.

3. Caution: Using batteries other than the ones provided may result in loss of performance and battery life, and also damage to the device. Dispose of properly, observing environmental protection rules.

4. Mount the back panel securely to the wall with at least 2 appropriate screws, using some of the six mounting holes.
   Caution: This device must not be placed near any louver, air vent, or other places exposed to fresh air (e.g., windows, door openings). Such placement will give false CO2 values.

5. Attach the sensor part to the back panel.

Service and maintenance
No serviceable parts inside. If service is needed other than battery replacement, please contact your distributor.

Sensor configuration

All sensor settings can be configured via a smartphone application with NFC
(Near Field Communication) or over the air via the network server and downlink data to the sensor. The sampling rate, spreading factor, encryption keys, port, and modes can be changed. All sensor settings can be locked from the server or NFC to make end-users unable to read or change settings on the sensor.

NFC Configuration

1. Download ELSYS “Sensor Settings” application from Google Play and install it on a smartphone or tablet. The device must support NFC.

2. Enable NFC on the device and start the application.

3. Place your device on top of the NFC antenna on the sensor.

4. Remove the device. Current settings will be displayed in the application.

5. Use the application to change any settings if needed.

6. Quickly tap the device on top of the NFC antenna to give the new settings to the sensor. Make sure that the application confirms your new settings.

7.  Wait for the sensor to reboot (5 sec), indicated by the LED flashing. Sensor settings have been updated.

See the section “Help” in the application for more information.

Over the air configuration
All settings may be configured over the air via your LoRaWAN® infrastructure. Please visit the support section on our webpage for more information regarding downlink protocol.
Application parameters
All parameters for the “Sensor settings” application can be found in our settings document. Please visit the support section on our webpage for more information.

Sensor behavior

NFC Read / Write

1. When reading or writing NFC configuration data to the sensor, it starts a timer and delays its action 5 seconds.

2. After the delay, the sensor determines if the NFC data has changed or not. If the data has changed, the sensor reboots and starts from power-up.

3. Write your settings in the application and then locate the NFC antenna of the phone and sensor. Keep the two devices close and don’t move them to get the best connectivity as possible when writing or reading data to the sensor. Bad connection can be caused
   by long distance, wrong location, or rapid movement.

4. When you have written data to the sensor, let the sensor reboot and restart before trying to write again.

You should always validate your settings by reading the NFC data after the sensor has restarted.

Sensor startup

1. When the sensor starts up, it loads configuration from the internal memory and merges it with user configuration.
2. When the configuration is done, the sensor writes the new configuration to the NFC chip. The sensor always writes new configurations to the NFC chip when something changes in the sensor or if NFC data is corrupted by an NFC writer or phone. The sensor always writes the new configuration to NFC chip at startup.
3. When the configuration is done, the sensor tries to join the network if OTAA (Over the Air Activation) is enabled.
4. The sensor LED flashes orange when it tries to join a network. It will try to join every 10 seconds initially. This interval will increase to save battery, at most up to one time per hour.
5. After successful connection to a network, the sensor sends a settings packet and enters sampling mode.

Sampling mode / Periodic measurement
The sensor makes periodic measurements according to the user configurations.

Schedule Transmission
The sensor transmits the data according to the user configurations.
Note: The configured sending interval can be overridden by network limitations. Due to this, the spreading factor and sending interval settings might result in longer intervals than intended.

Specifications

Sensor payload format
The device uses the standard ELSYS payload format. Please see the specified document on our webpage.

WEEE 2012/19/EU

Radio protocol:| LoRaWAN®
Radio frequency band:| US902-928, EU863-870, AS923, AU915-

928, KR920-923, RU864, IN865 & HK923

Range:| 8 km*
Recommended installation height:| 1.6 m
Operating conditions| 0 to 50 °C

0 to 85 % RH (non-condensing)

CO2 range| 0 – 2000 ppm (Extended: 0 – 10000 ppm)
CO2 noise| 14 ppm @ 400 ppm

25 ppm @ 1000 ppm

CO2 accuracy| ± 50 ppm ± 3 % of reading Extended: ± 3 % of reading
Temperature range| 0 – 40 °C
Temperature resolution| 0.1 °C
Temperature accuracy| ± 0.2 °C
Humidity range| 0 – 100 %
Humidity resolution| 0.1 % RH
Humidity accuracy| ± 2 % RH
Dimensions| 86 x 86 x 28 mm
Battery life| Up to 10 years***

Measured with settings: SF10, 868 Mhz. The range can be greater or less, depending on terrain and building structure.
Accuracy is met at 10 – 40°C, 0 – 60%RH, after minimum three (3) performed Automatic Baseline
Corrections, preferably spanning eight (8) days in-between, or a successful zero-calibration
Depending on settings and environmental factors.

Regulations Legal Notices
All information, including, but not limited to, information regarding the features, functionality, and/or other product specification, are subject to change without notice. ELSYS reserves all rights to revise or update its products, software, or documentation without any obligation to notify any individual or entity. ELSYS and ELSYS logo are trademarks of Elektroniksystem i Umeå AB. All other brands and product names referred to herein are trademarks of their respective holders.

Declaration of conformity
Hereby, Elektroniksystem i Umeå AB declares that ERS CO2 Lite complies with the essential requirements and other relevant provisions of Directive
2014/30/EU and 2014/53/EU.

Elektroniksystem i Umeå AB Industrivägen 12, 90130 Umeå, Sweden E-mail: support@elsys.se ǀ Web: www.elsys.se

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